Re: cellphone, mobile, handy
Thus many oikers and kIwis will use pants to mean trousers, cellphone for mobile, and a few others.
I used to know a tailor, who insisted to me that trousers is, essentially, a subset of pants. It was at this point that I realised that every profession has its own jargon which is generally speaking impenetrable to outsiders. I also suddenly remembered an urgent appointment, elsewhere*, for which I was running late.
* Probably to meet a Mr L Ager at the bar...